JPH0718120Y2 - Fuse device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a fuse device which is blown by an overcurrent and has a circuit which automatically recovers when the fuse blows due to natural deterioration of the fuse itself.

[Prior Art] The prior art will be described by taking a fuse device used for protection of a control circuit and the like shown in FIG. 3 as an example.

A substrate 1 made of an insulating heat-resistant resin, plate-shaped external terminals 2a and 2b made of a conductive material provided through the substrate 1, and connected to the external terminal 2a to form the substrate 1 A fixed conductor piece 3 made of a plate-shaped conductive material that is provided upright, and a movable conductor made of a conductive plate-shaped elastic material that is provided upright on the substrate 1 while being connected to the external terminal 2b. And a fuse circuit that is connected to the movable conductor piece 4 between the fixed conductor piece 3 and the movable conductor piece 4 by a fuse 5 in a state where the conductor pieces are constantly strained so as to oppose the restoring force of the movable conductor piece 4. ing.

Further, in this fuse device, the movable conductor piece 4 is provided on the substrate 1.
Auxiliary circuit that composes the alarm circuit is attached. The auxiliary circuit includes an auxiliary movable conductor piece 6 made of a conductive elastic material having an insulating protrusion on the upper surface and a movable contact on the back surface in the vicinity of the movable conductor piece 4, and the auxiliary movable conductor piece. 6 and a fixed side contact provided on a conductive auxiliary fixed conductor piece 7 at a position opposite to the contact. The plate-shaped auxiliary movable conductor piece and the auxiliary fixed conductor piece that are provided with both of these contacts pass through the substrate 1 and are provided with an insulating resin 14 between the terminals to form a pair of auxiliary external terminals 8a, 8b.
Is formed.

In the present fuse device, a casing 15 is provided on the substrate 1 with a display portion provided at the tip of the movable conductor piece, and an inspection hole provided in the ceiling portion for inspecting the operating condition of the movable conductor piece. .

When a current exceeding the rating flows in the fuse device and the fuse is blown by the heat generated by the conductive resistance of the fuse in the device,
The tension of the movable conductor piece 4 made of an elastic material is released, and it returns to its original position, pushing the protruding portion of the auxiliary movable conductor piece 6 provided in the vicinity of the movable conductor piece 4 to make the auxiliary movable conductor piece 6 side contact. The alarm circuit is activated by pressing the movable conductor piece side contact against the auxiliary fixed conductor piece 7 side contact provided opposite to each other, and the display section provided at the tip of the movable conductor piece has an inspection hole position of the housing 15. Fuse 5 from the outside to move to
It is possible to confirm the fusing of the.

[Problems to be solved by the invention]

The fuse device is generally not used in a high load circuit such as an electric motor, but is used in an operation circuit or the like with a small load.In the fuse blowout accident of the operation circuit, an overcurrent flows due to a failure of the circuit or the like. It does not always happen, but most of the accidents are due to the natural deterioration of the fuse itself, where the fuse only needs to be replaced. Therefore, first, the blown fuse device is replaced to determine whether it is due to a circuit failure or a simple natural deterioration of the fuse. Further, the fuse device is generally installed in a place such as the back surface of the operation circuit where replacement work is difficult to perform, and it takes time to replace it.

[Means for solving problems]

As a result of intensive studies to solve the above problems, an apparatus having the following components has been developed.

1) A pair of external terminals 2a and 2b made of a plate-shaped conductive material and penetrating a substrate made of insulating heat-resistant resin or ceramics, and connected to the external terminals 2a to form the substrate. A fixed conductor piece standing upright, 2) a movable conductor piece made of a plate-like conductive elastic material that is connected to the terminal 2b and stands upright on the substrate, and has a movable contact on the upper portion, 3) A first fuse circuit is formed by pulling the movable conductor piece toward the fixed conductor piece side and connecting the fixed conductor piece and the movable conductor piece with a fuse in a state where the movable conductor piece always has a restoring force. .

4) A movable contact is provided above the movable conductor piece, and a fixed contact that comes into contact with the movable contact when the fuse is blown is provided.

5) A fixed terminal is erected on the substrate at a distance from the fixed conductor piece, 6) The fixed terminal and the fixed contact are connected by a conductive material, and 7) The fixed conductor piece and the fixed terminal. And are connected by a fuse to form a second fuse circuit including the movable conductor piece, the movable contact, the fixed contact, the fixed terminal, and the fixed conductor piece when the first fuse circuit is blown.

8) Furthermore, as a preferred embodiment, an auxiliary movable conductor piece made of a conductive elastic material having an insulating projection on the upper surface and a movable side contact on the back surface in the vicinity of the movable conductor piece, and the auxiliary movable conductor piece. The alarm circuit includes a contact on the conductor piece and a fixed-side contact provided on the conductive auxiliary fixed conductor piece at a position facing each other.

〔Example〕

The operation of the fuse device of the present invention will be described in detail based on an embodiment.

FIG. 1 is a vertical sectional view of a fuse device of the present invention.

An outer case 15 made of the same material as the substrate 1 made of an insulating heat-resistant and flame-retardant resin, and a pair of plate-shaped external terminals 2a, 2b made of a conductive material and penetrating the substrate 1, and an external A fixed conductor piece 3 made of a plate-shaped conductive material, which is connected to the terminal 2a and provided upright on the substrate 1, and an external terminal 2b which is connected to the substrate 1 by a conductive material, are provided upright on the substrate 1. A movable conductor piece 4 made of a plate-shaped conductive elastic material, and a fixed conductor piece 3 and the movable conductor piece 4 are connected by a fuse 5a against the restoring force of the movable conductor piece 4. Fuse circuit is formed.

Further, a movable contact 11a is provided above the movable conductor piece 4 and contacts the movable contact 11a at a position facing the movable contact 11a, that is, in the state where the movable conductor piece 4 has no restoring force. A terminal 13 made of a conductive material and provided with a fixed contact 11b is attached to an insulating plate-shaped body 10 standing on the substrate 1, and a fixed terminal 9 is provided at a position facing the fixed conductor piece 3.
Is provided on the substrate, and the fixed conductor piece 3 and the fixed terminal are fused.
5b, and a structure in which a fixed terminal and a terminal 13 having a fixed terminal 11b are connected by a jumper wire 12 made of a conductive material. Usually, the external terminal 2a, the fixed conductor piece 3,
The circuit consisting of the fuse 5a, the movable conductor piece 4, and the external terminal 2b is energized, but due to the natural deterioration of the fuse,
When the fuse 5a of the first fuse circuit is blown, the restoring force of the movable conductor piece 4 causes the movable terminal 11a and the fixed terminal 11b to come into contact with each other, and the external terminal 2b, the movable conductor piece 4, and the movable contact 11a.
, Fixed contact 11b, terminal 13, jumper wire 12
The second fuse circuit is composed of the fixed terminal 9, the fuse 5b, the fixed conductor piece 3, and the external terminal 2a.

In addition, the fuse device of the present invention has a fuse 5a on the substrate 1.
It is equipped with an auxiliary circuit that constitutes an alarm circuit that accompanies the fusing or disconnection. The auxiliary circuit oscillates through a portion of the terminal that is made of an insulating member, and has a tip end portion provided with an insulating protrusion provided in the vicinity of the movable conductor piece 4 and a movable side contact on the back surface thereof. An auxiliary movable conductor piece 6 made of a conductive elastic material and a conductive auxiliary fixed conductor piece 7 having a fixed side contact for contacting and separating the movable side contact are erected on the substrate 1. An insulating resin which is connected to the auxiliary movable conductor piece 6 and the auxiliary fixed conductor piece 7 and is provided so as to penetrate the substrate 1.
It has a pair of auxiliary external terminals 8a, 8 in which 14 is mounted.

In the device of the present invention, the electric current is always supplied to the first fuse circuit formed between the fixed conductor piece 3, the fuse 5a, and the movable conductor piece 4 through the external terminals 2a and 2b. When the fuse 5a is cut due to an electric current or natural deterioration of the fuse, the movable conductor piece 4 made of an elastic material is held by the fuse 5a against the restoring force, so that the movable conductor piece 4 is released from the holding force. It returns to its original position due to its own restoring force, and the movable contact 11a and fixed terminal 11b of the movable conductor piece 4
Comes into contact with the external terminal 2b, the movable conductor piece 4, and the movable contact.
11a, fixed contact 11b, terminal 13, jumper wire
12, fixed terminal 9, fuse 5b, fixed conductor piece 3,
The second fuse circuit including the external terminal 2a is automatically energized.

At this time, if there is an abnormality on the load side of the circuit or the like, the above is automatically switched to the second fuse circuit, and the fuse is blown immediately after the energization is started. It is possible to determine if there is a fuse or natural deterioration of the fuse, and if there is an abnormality on the load side,
Find the part that caused the blowout, repair it, and replace the fuse device.

When the movable conductor piece 4 returns to its original position due to the disconnection of the fuse 5a, the protruding portion of the auxiliary movable conductor piece 6 for alarm, which is installed close to the movable conductor piece 5, is pushed, and the auxiliary movable conductor piece 6 is pushed. The movable side contact and the fixed side contact of the auxiliary fixed conductor piece 7 come into contact with each other to energize and activate the fuse blown alarm circuit.
Even if the alarm circuit operates, if the circuit etc. is operating normally thereafter, it can be confirmed that the first fuse circuit of one of the fuse devices has blown, and during the repair period such as at rest. Replace the fuse device.

Also, bend the tip of the movable conductor piece at an angle of about 90 degrees,
If a heat-resistant paint is applied to the surface of the first fuse and an inspection hole is opened at a position where the paint can be inspected only when the first fuse is blown on the ceiling of the case, the first fuse can be Since it is possible to confirm the presence or absence of abnormality, it is possible to confirm the abnormality of the fuse device from the outside, which is convenient at the time of replacement.

〔effect〕

According to the present invention, even if the fuse is deteriorated due to deterioration of the fuse itself even if the load side is normal, the circuit automatically returns to normal immediately and the second energization circuit is secured, so that the device It is possible to restart the system, etc., and minimize the downtime due to fuse blowout.

The fuse device, in which the first fuse is blown, can be easily replaced by replacing it when the equipment is stopped for a long period of time due to periodic repairs or the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fuse device of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 2, and FIG. 3 is a vertical sectional view of a conventional fuse device. 1: board, 9: fixed terminal 2ab: external terminal, 10: plate-like body 3: fixed conductor piece, 11ab: contact point 4: movable conductor piece, 12: jumper wire 5: fuse, 13: terminal 6: auxiliary movable conductor piece , 14: Insulating resin 7: Auxiliary fixed conductor piece, 15: Outer case 8ab: Auxiliary external terminal

Claims (1)

[Scope of utility model registration request] 1. A plate-shaped fixed conductor piece made of a conductive material and a movable conductor piece made of a plate-shaped conductive elastic material are erected on a substrate made of an insulating heat-resistant resin with a gap therebetween. A fuse device in which the fixed conductor piece and the movable conductor piece are connected by a fuse in a state where the two conductor pieces are constantly strained so as to oppose the restoring force of the movable conductor piece, A second structure in which a fixed terminal is provided at a distance from the conductor piece, and the fixed conductor piece and the fixed terminal are connected by a fuse.
A fuse circuit is provided, a movable contact is provided above the movable conductor piece, and a fixed contact is provided at a position where the movable conductor piece comes into contact with the movable conductor piece when the movable conductor piece returns to its original position due to a restoring force. A fuse device characterized by being connected to a fixed terminal.